College of Water Sciences, Beijing Normal University, Beijing 100875, China; State Key Laboratory of Environment Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
State Key Laboratory of Environment Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Sci Total Environ. 2018 Dec 10;644:1277-1285. doi: 10.1016/j.scitotenv.2018.07.034. Epub 2018 Jul 13.
This study investigates the effects of different influence factors on the removal of inorganic Sb species using coagulation-flocculation-sedimentation (CFS) and establishes the mechanism of the process. Thus, the influence of pH, initial Sb concentrations, coagulant dosages and competitive matters on Sb(V) and Sb(III) removal via CFS with polymeric ferric sulfate (PFS) was investigated systemically. Competition experiments and characterization methods, including X-ray diffraction (XRD), energy dispersive spectrometry (EDS), and X-ray photoelectron spectroscopy (XPS), were performed to determine the mechanisms of the process. The main conclusions included: (i) Optimum Sb removal was observed at a pH range of 4-6 and dosages of 4 × 10 mol/L and 8 × 10 mol/L for Sb(V) and Sb(III), respectively. Additionally, both Sb(V) and Sb(III) removal could be inhibited by the presence of phosphate and humic acid (HA). (ii) A higher priority was observed for the removal of Sb(III) over Sb(V). (iii) After excluding precipitation/inclusion/occlusion, coprecipitation involving chemical bonding played a significant role in both Sb(V) and Sb(III) removal, and electrostatic force served another significant role in Sb(V) removal. The Sb(V) and Sb(III) contamination in real contaminated waters was successfully removed using PFS via CFS process. The results of this study provide insights into the removal mechanisms of inorganic Sb species via CFS.
本研究考察了不同影响因素对混凝沉淀去除无机 Sb 物种的影响，并建立了该过程的机理。因此，系统研究了 pH 值、初始 Sb 浓度、混凝剂剂量和竞争物质对聚合硫酸铁（PFS）混凝沉淀去除 Sb(V)和 Sb(III)的影响。进行了竞争实验和表征方法，包括 X 射线衍射（XRD）、能谱（EDS）和 X 射线光电子能谱（XPS），以确定该过程的机理。主要结论包括：（i）在 pH 值为 4-6 且 Sb(V)和 Sb(III)的剂量分别为 4×10-5mol/L 和 8×10-5mol/L 时，Sb 的去除效果最佳。此外，磷酸盐和腐殖酸（HA）的存在会抑制 Sb(V)和 Sb(III)的去除。（ii）Sb(III)的去除优先于 Sb(V)。（iii）在排除沉淀/包含/包裹后，涉及化学键合的共沉淀在 Sb(V)和 Sb(III)的去除中起着重要作用，静电力在 Sb(V)的去除中也起着重要作用。通过 PFS 混凝沉淀工艺成功去除了实际受污染水中的 Sb(V)和 Sb(III)。本研究结果为通过 CFS 去除无机 Sb 物种的去除机制提供了新的见解。
